William h



(No Model.) 2 Shets-Sheet 1:

W. H. WIGMORE.

BLOWER.

Patented Sept. 11, 1883.

WM #5 11m m L II IB Ja e/2hr.

(No Model.)

W. WIGMORE.

" BLOWER.

No. 284,698. r Patented'Sept. 11, 1883'.

FIG 3 PEYERS. holoimmgmpher. wm w". u c.

2 Sheets-Sheet 2.

-UNITED STATEsf PATENT OFFICE.

VILLI'AM H. XVIGMORE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HENRY CLAYTON, OF SAME PLACE.

BLOWER.

I SPECIFICATION forming part of Letters Patent No. 284,698, dated September 11, 1883.

Application filed March 7, 1883.

To all whom, it may concern:

Be it known that I, WILLIAM H. WIGMoRn, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Blowers, of which the following is a specification.

The nature of my invention consists, in the,

first place, of two rods carrying a piston at each end, one fast and the other loose 011 the rods, and seated 011 spiral springs which surround the rods, in combination with the revolving drum and the cylinder of the blower, the said rods having longitudinal movement in holes through the shaftof the drum, and the pistons having a sliding movement in radial slots of the latter, whereby as the drum is revolved the pistons by the action of the springs are borne at all times against the i11- ner surface of the cylinder, as hereinafter described.

The invention, in the second place, consists of a small cylinder, in combination with an airconducting pipe of the pump, and the shifter of the belt, adapted to run interchangeably on tight and loose pulleys 011 the drum-shaft, the piston-rod being connected with the shifter and provided with a spring which balances the pressure of the air against the piston until the pressure exceeds the maximum force desired. It then yields to the pressure exerted against it, and permits a longitudinal movement of the piston-rod far enough to shift the beltonto the loose pulley to arrest the action of the blower until the pressure of the air is thereby reduced to the desired point.

In the accompanying drawings, which make a part of this specification, Figure 1 is a plan view of the blower and apparatus connected with it for shifting the belt E, partly in section, at the broken line 10 w of Fig. 2. Fig. 2 is avertical section at-the broken line 00 m of Fig. 1. Figs. 3 and 4 are side and edge views of the pistons G and G in connection with the rods F F.

Like letters of reference in all the figures indicate the same parts.

A represents the pumping-cylinder, which is .provided with an air-inlet opening, a, and an outlet-opening, b.

(No model.)

B is a revolving drum in the cylinder A, which is provlded with the shaft 0, having on one end tight and loose pulleys D and D,

over whichabelt, E, passes for connecting the shaft to asteam-engine or other motive power. The drum is provided with two pistons, each connected with one end of two rods, F F, the piston G having a'tight connection there with, as shown in Figs. 3 and 4, and the piston G being loose on the diminished end of the rods and cushioned on the springs H H, the rods having an easy fit in corresponding openings of the shaft 0 and the pistons in openings in the drum B, in such a manner that as the latter revolves in the cylinder A, which is arranged eccentrically with the drum,

the springs by their pressures against the shoulders c c of the rods in one direction and against the loose piston G in the other direction have an outward pressure against each piston, whereby in the revolutions of the drum B they are both caused to press against the inner face of the cylinderwith the requisite force to prevent the backward escape of the air. The ends of the rods surrounded by the springs H H arev only diminished in their diameter sufficiently to admit of the springs 'having an easy play in their vibrations. be

tween them and the surface of the cylindrical openings which fit the larger diameter of the 3 rods. By such construction and combination I get a solid thrust of the diminished ends of therods against the bottoms of the openings when the pistons pass the largest diameter of the cylinder, which has a much better result than could be obtained by having the rods of uniform diameter, whereby the springs would have a greater strain upon them. As the drum B revolves in the direction of the arrow,

the air is forced by the pistons into the conducting-pipe I and through it into a tank or reservoir. (Not seen in the drawings.)

J is a small cylinder provided with a piston, K, whose rod L is connected with the belt-shifter M at its outer end, and is provided with a spring, H, which balances the pressure of the air against the face of the piston until it advances above the maximum amount desired. Then the spring yields and permits the movement of the piston until the rod L carries the 100 shifter far enough to remove the belt E onto the loose pulley D, to arrest the action of the pump, and thus to economize the use of the motive power until the force of the air in the tank is required to be increased. Then, the force of the spring being greater than that of the air against the piston, the latter assumes its former position, whereby the belt is returned to its former position upon the tight pulley, to cause the pump to resume its operation. The piston-rods F nearly touch the abutments d of the piston D, to prevent too great contraction of the springs H and to insure a solid push.

I claim as my invention 1. The combination of the pistons G and G, rods F F, having one of their ends of diminished diameter, springs H H, drum B, shaft 0, and cylinder A, substantially in the manner and for the purpose set forth.

2. In combination with a rotary air-pump having a central shaft, 0, provided with tight and loose pulleys D and D, the cylinder J, piston K, provided with the rod L, having a spring, H, the belt-shifter M and belt E, connected with said pulleys, and a conductingpipe, I, connecting the said cylinder J directly with the pump-cylinder A, substantially in the manner and for the purpose set forth.

WILLIAM H. WIGMORE;

\Vitnesses:

STEPHEN UsTIcK, THOMAS J. BEWLEY. 

